| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [adj] period [prep] [noun] | 630 |
|
| 2 | a [adj] period [prep] [noun sg] | 570 |
|
| 3 | a [adj] period of [noun] | 535 |
|
| 4 | a [adj] period of [noun] | 535 |
|
| 5 | a [adj] period [prep] time | 319 |
|
| 6 | a [adj] period [prep] time | 319 |
|
| 7 | a long period [prep] [noun] | 160 |
|
| 8 | a short period [prep] [noun] | 85 |
|
| 9 | a brief period [prep] [noun] | 34 |
|
| 10 | a [adj] period [prep] [noun prp] | 34 |
|
| 11 | a [adj] period in [noun] | 29 |
|
| 12 | a [adj] period in [noun] | 29 |
|
| 13 | a [adj] period [prep] [noun pl] | 25 |
|
| 14 | a fixed period [prep] [noun] | 23 |
|
| 15 | a certain period [prep] [noun] | 23 |
|
| 16 | a considerable period [prep] [noun] | 22 |
|
| 17 | a limited period [prep] [noun] | 20 |
|
| 18 | a prolonged period [prep] [noun] | 19 |
|
| 19 | a reasonable period [prep] [noun] | 15 |
|
| 20 | a given period [prep] [noun] | 15 |
|
| 21 | a [adj] period for [noun] | 14 |
|
| 22 | a [adj] period for [noun] | 14 |
|
| 23 | a specified period [prep] [noun] | 13 |
|
| 24 | a lengthy period [prep] [noun] | 13 |
|
| 25 | a particular period [prep] [noun] | 12 |
|
| 26 | a [adj] period from [noun] | 8 |
|
| 27 | a [adj] period after [noun] | 8 |
|
| 28 | a [adj] period from [noun] | 8 |
|
| 29 | a [adj] period at [noun] | 8 |
|
| 30 | a [adj] period at [noun] | 8 |
|
